Robotic arm



FIG. 1 is a top view of a robotic arm embodying the design.

FIG. 2 is a bottom view thereof.

FIG. 3 is a front elevation view thereof.

FIG. 4 is a rear elevation view thereof.

FIG. 5 is a left side view thereof. The right side view of the robotic arm is a mirror image of the left side.

FIG. 6 is a left perspective view thereof; and,

FIG. 7 is a right perspective view thereof.

The broken lines in FIGS. 2, 3, 6 and 7 show portions a robotic arm that form no part of the claimed design. 

CLAIM The ornamental design for a robotic arm, as shown and described. 